Pneumatic rubber blanket



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H A KING ET A.

PNEUMATIC RUBBER BLANKET Filed oct'. 14. :1,920

A Wow/wav Patented Aug, lllll, i923 NETE STATES earaitr ernten,

HERMAN ALBERT KING, OF PORTLAND, .AND EDWIN O. ISLTIR, 0F HILLSDALE,OREGON.

PNEUMATIC RUBBER BLANEET.

Application tiled October 14, 1926. Serial No. 416,955?

To all whom it may concern.'

Be it hereby known that we, HERMAN .AL- BERT KING and EDWIN O. lsLEn,citizens 0f the United States, and residents, respectively, of Portland,count of Multnomah, and State of Oregon, and illsdale, county ofMultnomah, and State of Oregom have invented a new and useful PneumaticRubber Blanket, of which the following is a specication.

This invention relates more particularly to rubber blankets as are usedon web newspaper presses and similar machines.

The objects of our invention are several which may be briefly stated asfollows:

To provide a backing for the printing surface which will continuallycome back to its original position the instant the impression isremoved.

lThe utilization of the natural resiliency of the rubber' and confinedair to overcome defects in the stereotype. plates without requiringunusually heavy impressions.

To eliminate wear on the blanket itself by preventing its contact withthe cylinder.

To eliminate slipping on cylinder and breaking at hooks and stretchingpoints.

To eliminate sinks caused by pasters, etc., sticking to the cylinder.

To eliminate holsters and allow the presses to be driven with a minimumof power.

`We attain these results in the manner set forth in the followingspecification and illustrated in the accompanying drawing, in which 'zAll of the views are very much enlarged for the sake of clearness.Figure l is a sectional view along the line 1-1 in Figure 2. Figure 2 isa view of the under side of the blanket. Figure 3 is a cross sectionshowing the appearance ot the blanket under an impression.

Similar numbers of reference refer to the same or similar partsthroughout the several views.

Referring in detail to the drawing, we have illustrated the location ofthe stereotype plates 4 for touching the printing sheet 5 which restsupon the usual felt pad 6. Referring more particularly to our inventionattention is drawn to the rubber blanket 7 on whose under side is formeda plurality of cups 8 placed as closely as possible on the sheet and yetnot being permitted to touch each other when flattened -to come back toits original The of the cups 8 mayrest out under an abnormal impression.

lower end 9 of each Adirectly upon the cylinder 10 or upon )anthat thestereotype too much and the backino' is gradually pounded into acondition w ere its ability shaperis lost. hard, and the greater theimpression ln other words, it becomes' harder it becomes the isrequired.

The next difficulty encountered from the use of over-impression is thefact that the cylinder carrying the blanket. is gradually becomingsmaller in diameter than the stereotype plate cylinder, and as these aregeared together it follows that the peripheral speed of the blanket isless than that of the plates, causing, in many cases, a marked degree ofa wiping impression rather than a straight impression. This action notonly produces work of interior appearance, but also tends to tear thcweb of aper between the blanket and the plate.

ver-impression also produces what is known to the art as holsters, whichis the area on the blanket underneath the margins, etc., which'receiveno impression and therefore remain raised to their original height.Unless these holsters are continually removed they add a very largepercentage to the total of ruined paper passing through the press.

Another feature not commonly appreciated, but nevertheless veryimportant, is the fact that in maintaining sufficient impression whenusing the present style of blanket l i ing gears and cause same to meshinproperly, thereby causing undue wear and undesirable expenditure ofpower 1n driving same.

In the construction of our device we are enabled to maintain all of theimpression required Without .forcing the blanket against its cylinder,thereby prolonging the life of the material in the blanket, as Well asfurnishing a more uniform impression over the entire surface. As beforestated, this blanket when once stretched upon the cylinder Will beincapable of slipping inasmuch as each of the cups-8l holds its portionof the blanket to the cylinder.

`We are Well aware that vacuum cups have been used in numerous mannersand places for automobile tires, etc., and do not intend to claim theuse of these cups broadly but to limit ourselves to their use andapplication to the printing art as herein described.

In order to more completely conine the air under the blanket and therebysupport the entire blanket on an air cushion, We have also provided amarginal pad 1l which is the same height as the cups 8. Its function isself-evident since it furnishes an enclosure for the entire group ofcells on the blanket. It is necessary, of course, to provide one endwith a tail of the same thickness for clamping and to perforate theopposite end to match the hooks now in use on the presses.

l/Vhat We claim as new and desire to protect by Letters Patent of theUnited States 1s:-

l. A printers blanket consisting of a sheet of rubber adapted to besecured around the cylinder of a press and having formed on itscylinder-engaging 'face a plurality of cup members projecting entirelybeyond the cylinder side of said blanket and having dared openings whichdo not extend intd" the sheet portion of the blanket but form an elasticcushion for said sheet.

meagre 2. A 'printers blanket consisting of a sheet of rubberA adaptedto be secured around the cylinder of a press and having formed on itscylinder-engaging face a plurality of cup members projecting entirelybeyond the cylinder side of said blanket and having Hared openings whichdo not extend into the sheet-portion of the blanket, and having acontinuous border around the edge of said sheet the same height as aresaid cups.

3. A printers blanket consisting of a sheet of rubber adapted to besecured around the cylinder of a press and having formed on itscylinder-engaging face a plurality of cup members projecting entirelybeyond the cylinder side of said blanket and having dared openings whichdo, not extend into vthe sheet portion of the blanket, said cup membersforming diagonal rows in which said cups are nearer together than in onedirect-ion parallel to one edge of said blanket.

fl. A; printers blanket consisting of a sheet of rubber adapted to besecured around the cylinder of a press and having formed on itscylinder-engaging i ace a plu rality of cup members projecting entirelybeyond the cylinder side of said blanket and having flared openingsWhich do not extend into the sheet portion of the blanket, said cupmembers forming diagonal rows in which said cups have closer spacingthan in the rows of cups Which are parallel to one edge of the sheet,and a continuous border equal in height to said cups adapted to conline,air betvveen said blanket and the press cylinder outside. of said cups.

n. ALBERT Knie. nnvvm o. isnaia.

